摘要
使用有限元模拟软件DEFORM-3D分别对不同截面工件的包套等径角挤压过程进行数值模拟,分析了试样截面形状为圆形和正方形的EACP模型变形过程中应变分布及损伤因子的大小。结果表明,不同截面试样稳定变形阶段等效应变分布规律相似,圆截面试样的垂直方向等效应变分布更加均匀;挤压过程中,圆截面试样完全处于压应力状态,方截面试样在剪切变形区受到拉应力会导致包套开裂、内部坯料萌生裂纹甚至发生断裂;对比方截面试样,圆截面试样损伤因子较小;建议AZ31镁合金包套ECAP工艺的工件截面设定为圆形截面。
DEFORM-3Dsoftware was used to simulate the equal channel angular pressing（ECAP）of different cross-section workpieces.The distribution of strain and damage factor during the deformation process of the EACP with circular cross-section and square cross-section were analyzed,which provided a reference for the actual experiment of canned-ECAP of AZ31 magnesium alloy.The results show that distribution of equivalent strain is similar at different sections,and the equivalent strain distribution at the vertical direction exhibits more uniform.In extrusion process,the circular cross-section specimen is completely in the compressive stress state,while the tensile stress of the square cross-section specimen in the shear deformation zone will cause the cladding to crack,and the internal blanks will initiate crack or even fracture.Compared with square cross-section specimens,damage factor of circular cross-section is very small.AZ31 magnesium alloy cladding ECAP workpiece cross-section is set to circular cross-section.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2017年第4期432-435,共4页
Special Casting & Nonferrous Alloys
基金
国家自然科学基金资助项目(51304145
51574176
515474152)
关键词
包套等通道挤压
镁合金
有限元
工件截面
Canned-ECAP
Magnesium Alloy
Finite Element Simulation
Cross-section
